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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

Hello everyone,

   

I am developing a DAQ using PSOC 3 and I have 2 strain guage sensers I want to power them using the Kit. the power requirement is DC 12(10.5~15)V 30mA MAX for the first sensor. and DC 24(21~30)V 30mA MAX for the other one.

   

Please help me doing this.

   

maxdamage

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JoMe_264151
Expert II

As I understand you cannot power the sensors with your kit except switching the sensor's supply using a relay or something similar.

   

You will need to shift the sensor's outputs to the range the PSoC is powered with which is 0 to 5V or 0 to 3.3V

   

 

   

Bob

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JoMe_264151
Expert II

For signal level shift follow this thread: www.cypress.com/

   

 

   

Bob

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ETRO_SSN583
Esteemed Contributor

The link in the prior post will be of no help if its traditional bridge type strain

   

gauge sensor.

   

 

   

Post a link to your sensor datasheet so we can look at the requirements further.

   

 

   

Generally speaking you if you can run the sensor at a lower V then

   

you can get the bridge connections CM range into the PSOC A/D

   

CM range. which for a 5V part is roughly 5V. Key to the design is

   

what sensitivity the sensor has.

   

 

   

Some questions -

   

 

   

1) Resolution of the system you are seeking ?

   

2) Absolute accuracy desired in system ?

   

3) Dynamic range of system ?

   

4) Is your system power at 12V and you derive PSOC Vdd off that  or

   

do you need to develop the 12 V seperately ?

   

5) Sensor a raw sensor or is it internally signal conditioned ? Link to datasheet

   

will answer this.

   

 

   

If you have to run the bridge at 12V then you will need an external IA

   

to handle the diff mode CM range G needed and level shift.

   

 

   

Regards, Dana.

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ETRO_SSN583
Esteemed Contributor
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Anonymous
Not applicable

Dear all,

   

Kindly receive the attached datasheet. I just want the excitation signal to power the sensor I'll handle the analog output of the sensor.

   

Thanks and regards,

   

maxdamage.

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ETRO_SSN583
Esteemed Contributor

A simple boost regulator, charge pump or L based.

   

 

   

You could roll your own, using a PSOC comparator in a Hysteretic configuration,

   

one of the simplest architectures.

   

 

   

TI, LTC, On, Fairchild, tons of solutions out there, even low power stuff, most

   

dirtball cheap.

   

 

   

A good place to go is TI/NSC Webench design tool, very easy to do a design with

   

schematic generated and thermals considered.

   

 

   

    

   

          http://www.ti.com/lsds/ti/analog/webench/overview.page

   

 

   

Regards, Dana.

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